Yes, and buff the ants

Yes, but don't buff the ants

No

No, but buff the ants

Grenadiers are faster then any t1 vehicle and shoot further then any t1 vehicle, therefor they kill them all. Bomber can be scary but with just a few spinners in the mix its no problem at all anymore. Dox and boombots can be used effectively against just grenadiers (still takes some skill) but with a few ants, dox and infernos in a mix thats heavy on the grenadiers, you kill all t1 compositions i think. I'd say grenadiers are as overpowered as how well you micro them. The better your apm and micro, the more grenadiers you should use.